I have a 812S, and currently I am using "CG5G - patched - improved burn quality (for 451S, 851S, 812S, 832S, Sony 700A, etc.)".After I flash another 812s's eeprom for the led problem,the drive can't burn any cd or dvd,and a blank disc after burning(Software can show the burning progress) is still blank.I try to 'reset learnt media',but the drive still can't work.